Momcozy Sleep Sack for Baby 0-6 Months, 1.5 TOG Baby Wearable Blanket with Supportive Plush Filling, Two-Way Zipper for Easy Diaper Changes, Snap-Fit Design for Growing Babies, Small, Blue

"Sous vide" got me cackling lol. OP I have him sleep in a long sleeve cotton shirt and just this: https://www.amazon.com/dp/B0G43W94RN?ref_=ppx_hzod_image_mob_b_fed_asin_title_0_0 My house is about 70 degrees and we always have a strong fan going so we are a little chilly without a moderate blanket. No pants, no socks on him and he does just fine. It's like a light sleeping bag material.